Easy way to flip word order

Output I am boy as boy am I

First convert I am boy to yob ma I, exchange str[0] with str[len-1] order, the space complexity is O(1). Then apply the same method to flip each word in yob ma I.

function reverse(str) {
   var strArr = str.split("");   
   var len= Math.floor(str.length/2),strLen = str.length-1;   
   for(var i=0;i<len;i++){     
   var temp = strArr[i];
     strArr[i] = strArr[strLen - i];
     strArr[strLen - i] = temp;
   }   return strArr.join("");
}function reverseWord(str) {
    str = reverse(str);    
    var strArr = str.split(" ");    
    var newArr = strArr.map(function (item) {
      return  reverse(item);
    });    return newArr.join(" ");
}


console.log(reverseWord("I am boy"));

(1) Note that the string needs to be converted into a character array, because the array is a reference type, and exchange with each other can change the original value, but strings cannot. For example:

var str = "boy";str[0].=str[2];
console.log(str);

(2) Question: A new array newArr

is introduced

The above is the detailed content of Easy way to flip word order. For more information, please follow other related articles on the PHP Chinese website!